I work for Acer and can assure you that we have no plans to stop selling the Aspire One 8.9". We actually believe the 10" and 8.9" appeal to a different type of customer and can therefore exist side by side. More 8.9" Linux stock will be arriving in the next couple of weeks with updated specification, but still at a great price.
If you would like any more info on the 10", the press release has gone up this morning:
(sorry for the long link)